And what a vibe! In the snapshot, "The Voice" mentor shows off his famously tattooed bod — and abs! — as he runs down a hallway in nothing but a pair of black, low-slung briefs and sunglasses.

We hope Levine opts for a little more coverage when they do tie the knot. The couple dished up one of the more surprising headlines of the summer when they announced in July that, after being broken up for several months and Levine having a new girlfriend, they were suddenly back together and engaged.

Prinsloo's Instagram pic comes as a bit of a surprise not only because Levine is nearly naked. The duo is actually pretty private when it comes to their relationship, and while she regularly posts photos on Instagram, they are typically of herself, not him.

Well, we respect her editorial judgement. This was a great one to share.